How to fix Install is damaged and cant be opened. You should eject the disk image on iMac

[Solution] Open install is damaged and cannot be opened, you should eject the disk. Solution 1. Open the terminal, enter “ sudo spctl --global-disable “, press Enter, enter the password (the password is not displayed), press Enter. 2. Continue to enter “ xattr -cr “ in the terminal, add a space key after the code, drag into terminal and press Enter. Watch Video for detail tutorial : Code required : sudo spctl --global-disable xattr -cr .... Music track: Vision by Damtaro Source: Free To Use Music for Videos